SIOUX FALLS, a city and the county-seat of Minnehaha county, South Dakota, U. S. A., on the Big Sioux river, about 12 m. N.W. of the N.W. corner of Iowa. Pop. (1890), 10,177; (1900) 10,266, of whom 1858 were foreign-born; (1905), 12,283; (1910), 14,094. It is the largest city in the state. Sioux Falls is served by the Chicago, Milwaukee & St Paul, the Chicago, Rock Island & Pacific, the Great Northern, the Illinois Central, the Chicago, St Paul, Minneapolis & Omaha (North-Western lines), and the South Dakota Central railways. In the city are the State Penitentiary, the State Children's Home, the South Dakota School for Deaf Mutes, a United States Government
Building, the County Court House, Sioux Falls College (Baptist; used as a container for aerated waters a tube passes through the neck of the vessel, one end terminating in a curved spout while the other reaches to the bottom of the interior. On this tube is a spring valve which is opened by pressing a lever. The vessel is filled through the spout, and the water is driven out by the pressure of the gas it contains, when the valve is opened. The " Regency portable fountain, " patented in 1825 by Charles Plinth, was the prototype of the modern siphon, from which it differed in having a stopcock in place of a spring valve. The " siphon champenois " of Deleuze and Dutillet (1829) was a hollow corkscrew, with valve, which was passed through the cork into a bottle of effervescent liquid, and the " vase siphoide " of Antoine Perpigna (Savaresse pere), patented in 1837, was essentially the modern siphon, its head being fitted with a valve which was closed by a spring.